Saxon » SaxonJS

Confirmed that the problem occurs using either compiler to compile the stylesheet.

The problem appears to be that the value of regex-group() does not survive the creation of a new dynamic context by the "/" operator.

The code for the slash operator (Expr.forEach) does

                const c2 = context.newContext(false);
                c2.focus = Iter.Tracker(arg(context));

but the regex groups are held in c2.focus.regexGroups, which is not preserved by these instructions.

I think it's wrong that regexGroups should be a property of context.focus, rather than context itself, so I'm seeing what happens if we change this.

This change fixes the problem, but it needs to be regression-tested.

Regression testing revealed the need to reset regex-groups when evaluating user functions and patterns. The change now seems OK.

It would be useful to add a test to XSLT3 to catch this condition.